#include<stdio.h>

void swap_two_num(int *p, int *q);
int main(int argc, char *argv[])
{
	int num1 = 999;
	int num2 = 888;

	printf("%d %d", num1, num2);
	swap_two_num(&num1, &num2);
	printf("%d %d", num1, num2);
	return 0;
}

void swap_two_num(int *p, int *q){
	int temp;
	temp = *p;
	*p = *q;
	*q = temp;
	return;
}


